diff --git a/src/gui/qopenglplotter.cpp b/src/gui/qopenglplotter.cpp
index 0e65e8f1..2c358b20 100644
--- a/src/gui/qopenglplotter.cpp
+++ b/src/gui/qopenglplotter.cpp
@@ -382,8 +382,10 @@ void ssr::QOpenGLPlotter::_draw_reference()
 
     glTranslatef(0.03f, -0.03f, 0.0f);
 
-    // rotate according to reference position
-    glRotatef(_scene.get_reference().orientation.azimuth, 0.0f, 0.0f, 1.0f);
+    // rotate according to reference offset position
+    glRotatef(_scene.get_reference().orientation.azimuth +
+              _scene.get_reference_offset().orientation.azimuth,
+              0.0f, 0.0f, 1.0f);
 
     glBindTexture(GL_TEXTURE_2D, _listener_shadow_texture);
 
@@ -396,8 +398,10 @@ void ssr::QOpenGLPlotter::_draw_reference()
 
     glPopMatrix();
 
-    // rotate according to reference position
-    glRotatef(_scene.get_reference().orientation.azimuth, 0.0f, 0.0f, 1.0f);
+    // rotate according to reference offset position
+    glRotatef(_scene.get_reference().orientation.azimuth +
+              _scene.get_reference_offset().orientation.azimuth,
+              0.0f, 0.0f, 1.0f);
 
     glBindTexture(GL_TEXTURE_2D, _listener_texture);
 
diff --git a/src/gui/quserinterface.cpp b/src/gui/quserinterface.cpp
index 782ff5b8..a701564c 100644
--- a/src/gui/quserinterface.cpp
+++ b/src/gui/quserinterface.cpp
@@ -980,8 +980,8 @@ void ssr::QUserInterface::mouseMoveEvent(QMouseEvent *event)
     // absolut mouse position in OpenGL coordinates
     Position mouse_pos(static_cast<float>(pos_x), static_cast<float>(pos_y));
 
-    // position relative to reference position
-    mouse_pos -= _scene.get_reference().position;
+    // position relative to reference position offset
+    mouse_pos -= _scene.get_reference_offset().position;
 
     _get_openGL_pos(_previous_mouse_event.x(),
                     _previous_mouse_event.y(),
@@ -990,11 +990,12 @@ void ssr::QUserInterface::mouseMoveEvent(QMouseEvent *event)
     // previous absolut position in OpenGL coordinates
     Position prev_mouse_pos(static_cast<float>(pos_x), static_cast<float>(pos_y));
 
-    // previous position relative to relative position
-    prev_mouse_pos -= _scene.get_reference().position;
+    // previous position relative to relative position offset
+    prev_mouse_pos -= _scene.get_reference_offset().position;
 
-    _controller.take_control()->reference_rotation(_scene.get_reference().orientation +
-                                          (mouse_pos.orientation() - prev_mouse_pos.orientation()));
+    _controller.take_control()->reference_rotation_offset(_scene.get_reference().orientation +
+                                                          _scene.get_reference_offset().orientation +
+                                                          (mouse_pos.orientation() - prev_mouse_pos.orientation()));
 
   } // else if
 
diff --git a/src/trackerpolhemus.cpp b/src/trackerpolhemus.cpp
index f2651ae8..fcfad114 100644
--- a/src/trackerpolhemus.cpp
+++ b/src/trackerpolhemus.cpp
@@ -192,7 +192,7 @@ ssr::TrackerPolhemus::_open_serial_port(const char *portname)
 void
 ssr::TrackerPolhemus::calibrate()
 {
-  _az_corr = _current_data.azimuth;
+  _az_corr = _current_data.azimuth + 90;
 }
 
 void
diff --git a/src/trackerrazor.h b/src/trackerrazor.h
index f0ab35e4..34fc9cdf 100644
--- a/src/trackerrazor.h
+++ b/src/trackerrazor.h
@@ -57,7 +57,7 @@ class TrackerRazor : public Tracker
       if (_tracker != nullptr) delete _tracker;
     }
 
-  virtual void calibrate() { _az_corr = _current_azimuth; }
+  virtual void calibrate() { _az_corr = _current_azimuth + 90; }
 
   private:
     /// constructor
diff --git a/src/trackervrpn.cpp b/src/trackervrpn.cpp
index 0f171602..934a1568 100644
--- a/src/trackervrpn.cpp
+++ b/src/trackervrpn.cpp
@@ -109,7 +109,7 @@ ssr::TrackerVrpn::vrpn_change_handler(const vrpn_TRACKERCB t)
 void
 ssr::TrackerVrpn::calibrate()
 {
-  _az_corr = _current_azimuth;
+  _az_corr = _current_azimuth + 90;
 }
 
 void